html,
body {
  height: 100%;
  font-size: 16px;
  font-family: 'Helvetica Neue', STHeiti, 'Microsoft YaHei', Helvetica, Arial, sans-serif;
}
.wrap {
  min-height: 100%;
  height: auto;
  margin: 0 auto -60px;
  padding: 0 0 60px;
}
.wrap > .main {
  padding: 0 0 20px;
}
.footer {
  height: 60px;
  background-color: #f5f5f5;
  border-top: 1px solid #ddd;
  padding-top: 20px;
}
header.nav {
  padding: 0 0 10px 0;
  margin: 0;
  border-bottom: 4px double #CCC;
}
header.nav .header {
  font-size: 48px;
}
header.nav .nav {
  margin-top: 20px;
  font-size: 18px;
}
.extension-content {
  margin-top: 20px;
}
.extension h2 {
  border-bottom: 1px solid #CCC;
  padding-bottom: 10px;
}
.extension h3 {
  border-bottom: 1px dashed #CCC;
  padding-bottom: 10px;
}
